8. h1g1 [%c_effect g1;square;g1;type;Interesting;persistent;true] An interesting and fresh move. Usually White prepares the advance of the g-pawn with f3 or even h3. 8... b7b5 This move has been played just once previously. 9. g2g4 A normal reply, but White has two interesting alternatives. 9... c8b7  10. d1d3 Not a very attractive square for the queen.